Dhanalakshmi College of Engineering

Chennai, India

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Malathi P.,Dhanalakshmi College of Engineering | Vivekanandan P.,Anna University
Asian Journal of Information Technology | Year: 2016

The growing internet access rate makes the malicious users to spread malware, spyware, viruses into the genuine users storage medium and steal many user specific personal information. Also, the malware spoils the working of user devices and reduces the performance and usage of the user computers. The user information steals by the malware are used to perform various malformed activities by them. Sometimes, the malware which intrudes into the user devices transfer many information about the customer information which can be used to perform various network threats. To solve this issues, there are many antivirus programs and tools are designed which monitor the activities and presence of viruses in the user devices. Apart from this, there are few scripts which are running at the time of user visit which transfers much user personal information without knowing the users. This kind of programs or scripts will not be monitored by any virus programs or security tools. By considering these client side scripts, a stream estimation based end point elimination technique is proposed and it identifies a set of endpoints or connections established at any point of time and eliminates un_trusted connections to secure the internet access. The proposed approach has produced efficient results in client script restriction and has reduced the time complexity also. © Medwell Journals, 2016.

Ramachandra Murthy A.,CSIR - Central Electrochemical Research Institute | Shanmuga Priya D.,Dhanalakshmi College of Engineering
Structural Engineering and Mechanics | Year: 2017

Reinforced concrete is a complex material to be modeled in finite element domain. A proper material model is necessary to represent the nonlinear behaviour accurately. Though the nonlinear analysis of RC structures evolved long back, still an accurate and reliable model to predict the realistic behaviour of components are limited. It is observed from literature that there are three well-known models to represent the nonlinear behaviour of concrete. These models include Chu model (1985), Hsu model (1994) and Saenz model (1964).A new stress-strain model based on Weibull distribution has been proposed in the present study. The objective of the present study is to analyze a reinforced concrete beam under flexural loading by employing all the models. Nonlinear behaviour of concrete is considered in terms of stress vs. strain, damage parameter, tension stiffening behaviour etc. The ductility of the RC beams is computed by using deflection based and energy based concepts. Both deflection ductility and energy based ductility is compared and energy based concept is found to be in good correlation with the experiments conducted. The behavior of RC beam predicted using ABAQUS has been compared with the corresponding experimental observations. Comparison between numerical and experimental results confirms that these four constitutive models are reliable in predicting the behaviour of RC structures and any of the models can be employed for analysis. Copyright © 2017 Techno-Press, Ltd.

Rajkumar R.,Dhanalakshmi College of Engineering
2013 IEEE International Conference on Emerging Trends in Computing, Communication and Nanotechnology, ICE-CCN 2013 | Year: 2013

The modern mobile communication systems requires high gain, large bandwidth and minimal size antenna's that are capable of providing better performance over a wide range of frequency spectrum. This requirement leads to the design of Microstrip patch antenna. This paper proposes the design of 4-Element microstrip patch antenna array which uses the corporate feed technique for excitation. Low dielectric constant substrates are generally preferred for maximum radiation. Thus it prefers Taconic as a dielectric substrate. Desired patch antenna design is initially simulated by using high frequency simulation software SONNET and FEKO and patch antenna is designed as per requirements. Antenna dimensions such as Length (L), Width (W) and substrate Dielectric Constant (εr) and parameters like Return Loss, Gain and Impedance are calculated using high frequency simulation software. The antenna has been designed for the range 9-11 GHz. Hence this antenna is highly suitable for X-band applications. © 2013 IEEE.

Hemalatha M.,Dhanalakshmi College of Engineering | Suriyanarayanan N.,Government College of Technology, Coimbatore
Optik | Year: 2014

Nickel nanoparticles have been synthesized by chemical reduction method. By the analysis of X-ray diffraction, the resultant particles are characterized and found to be pure crystalline nickel with a face-centered cubic (FCC) structure. The morphology and size of the nanoparticles are studied by scanning electron microscopy (SEM) and micrographs reveal that the nanoparticles are mostly spherical. The compositional analysis has been carried out by using EDAX. The quantum size confinement of the crystallites is evident from the blue-shift of the absorption edge in the UV-vis absorption spectrum. © 2013 Elsevier GmbH.

Saravanan R.,Dhanalakshmi College of Engineering | Saravanan R.,University of Madras | Gupta V.K.,Indian Institute of Technology Roorkee | Narayanan V.,University of Madras | Stephen A.,University of Madras
Journal of the Taiwan Institute of Chemical Engineers | Year: 2014

The novel ZnO/γ-Mn2O3 (various weight percentages) nanocomposite catalysts were prepared by thermal decomposition method and their size, shape, and surface area were characterized by various techniques. Further, the prepared samples were used to degrade methylene blue (MB) and methyl orange (MO) in aqueous medium under visible light irradiation. Finally, the best catalyst was employed to degrade phenol and a textile effluent. The recycling ability and their efficiency of catalyst are discussed in detail. © 2013 Taiwan Institute of Chemical Engineers.

Selvakumar N.,Mepco Schlenk Engineering College, Sivakasi | Jeyasubramanian K.,Mepco Schlenk Engineering College, Sivakasi | Sharmila R.,Dhanalakshmi College of Engineering
Progress in Organic Coatings | Year: 2012

Nano containers with a shell possessing controlled release properties can be used to fabricate a new family of active coatings that can respond quickly to change the environment/integrity of the coatings. The release of corrosion inhibitors encapsulated within nano containers can prevent further corrosion. The structural evolutions and morphological characteristics of nano particles are investigated using XRD, SEM, FT-IR and AFM. The author reports an in situ encapsulation method demonstrating over an order of magnitude size reduction for the preparation of urea-formaldehyde capsules filled with a healing agent, linseed oil and corrosion inhibitors. Capsules with diameters as small as 30-40 μm are achieved using stirring techniques. Cracks in paint film were successfully healed when linseed oil and nanoparticles was released from microcapsules ruptured under stimulated mechanical action. Further linseed oil healed area was found to prevent corrosion of the substrate. © 2012 Elsevier B.V. All rights reserved.

Chithambaram V.,Dhanalakshmi College of Engineering | Krishnan S.,B.S. Abdur Rahman University
Optics and Laser Technology | Year: 2014

Urea Zinc Acetate (UZA), a novel semi organic nonlinear optical crystal having dimensions 30×28×10 mm3 has been synthesized using slow evaporation technique. The lattice parameters for the grown crystals were determined using single crystal XRD. The presence of functional groups for the grown crystals was confirmed using Fourier Transform Infrared (FT-IR) spectroscopy. The optical absorption studies show that the material has wide optical transparency in the entire visible region. The thermal stability of the crystal was determined from thermo gravimetric and differential thermal analysis curve. The second harmonic generation was confirmed by Kurtz powder method and it is found to be 3 times than that of KDP crystal. © 2013 Elsevier Ltd.

Shanmugan S.,Dhanalakshmi College of Engineering
2013 International Conference on Energy Efficient Technologies for Sustainability, ICEETS 2013 | Year: 2013

A single slope single basin type solar still has been designed and fabricated. The system has been tested with dripping of saline water on cotton fin wick in the basin liner. Energy balance equations for the moist air inside the still, glass cover and fin cotton wick have been written and solved to get the analytical expressions for the instantaneous efficiency of the proposed system. The numerical calculations have been done and validated with the experimental observations for a few typical days during October 2011 and September 2012. © 2013 IEEE.

Deepa Shri S.,Dhanalakshmi College of Engineering | Thenmozhi R.,Vellore Institute of Technology
Life Science Journal | Year: 2013

In this study new mathematical models were proposed and developed by using a regression equation for the prediction of impact energy absorption of hybrid ferrocement slabs. Slabs were made up of self-compacting concrete (SCC) in order to minimize the external vibration work. Slabs of size 300 X 300 mm with varying parameters such as depth of slab (25 & 30 mm), number of layers of weld mesh (2 and 3 layers bundled), and wrapping with Glass Fiber Reinforced Polymer sheets (GFRP) (1 and 2 layers) along with a specified proportion (0 and 0.30%) of polypropylene fibers were cast. Impact load was applied by means of a hammer of weight 3.5 kg (34.335 N) and the initial and ultimate energy absorptions were evaluated. The variables used in the prediction models were the varying parameters such as number of layers of GFRP sheet, area of weld mesh and height of drop. According to the analysis, the models provide good estimation of impact energy absorption and yielded good correlations with the data used in this study.

Geerthy T.,Dhanalakshmi College of Engineering
2015 International Conference on Communication and Signal Processing, ICCSP 2015 | Year: 2015

Clinical breath analysis has been recognized for centuries, to detect the diseased state in humans. The exhaled breath consists of volatile organic compounds (VOC) which reflect the health status of an individual. Among the various gas molecules present in breath, ammonia specifically indicates the presence of pathological conditions like renal failure, gastric ulcer, liver failure etc. and hence can be used in diagnosis. Such monitoring can be done using existing techniques like Gas chromatography which involve a difficult sampling process and incur high cost. In this work, a low-cost and a less complex prototype model was developed to detect the presence of ammonia in human breath. This non-invasive technique involves a semiconductor sensor which is sensitivity to ammonia, has been calibrated and used to detect the presence of ammonia from the collected breath samples. The output generated is then interfaced to PC and finally the samples are analyzed for diagnostic applications. © 2015 IEEE.

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